redhead vs Melanerpes erythrocephalus

redhead and Melanerpes erythrocephalus both are nouns.

Word	Noun	Adjective	Verb	Adverb
redhead	Yes	No	No	No
Melanerpes erythrocephalus	Yes	No	No	No

As nouns, redhead and Melanerpes erythrocephalus are synonyms defined as:

redhead and Melanerpes erythrocephalus: black-and-white North American woodpecker having a red head and neck

Other synonyms of redhead include redheaded woodpecker.

redhead (noun)	Melanerpes erythrocephalus (noun)
black-and-white North American woodpecker having a red head and neck	black-and-white North American woodpecker having a red head and neck
North American diving duck with a grey-and-black body and reddish-brown head
someone who has red hair